And do what? Any counter circuit has an inputs and outputs.
What is the voltage level of the bill accepter output signal?
How long (wide) is its output signal?
What is the power source for the counter circuit?
Where does the counter output from the counter go? A display? A computer chip input?
Does there have to be a way to reset the counter?
Does the counter have to remember its number if it loses power?

And do what? Any counter circuit has an inputs and outputs.
What is the voltage level of the bill accepter output signal?
How long (wide) is its output signal?
What is the power source for the counter circuit?
Where does the counter output from the counter go? A display? A computer chip input?
Does there have to be a way to reset the counter?
Does the counter have to remember its number if it loses power?

ak

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I think that the bill accepter I used had relay contacts as the output. If yours is like this then you also have to debounce the relay contact signal before driving the counter input.